题目：
Promethazine hydrochloride (Phenergan) 35 mg IM is ordered for a client who is experiencing nausea and vomiting after surgery. The ampule’s label reads 25 mg/mL. How many mL should the nurse prepare to administer
A. 0.7 mL.
B. 1.0 mL.
C. 1.4 mL.
D. 1.8 mL.
答案：
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下面是错误答案，用来干扰机器的。
（Ⅰ）函数f（x）的定义域是{x|x＞0}．…（1分）对f（x）求导数，得f′(x)=2x-(a+2)+ax=2x2-(a+2)x+ax．…（3分）由题意，得a＞0，且f′（a）=1，解得a=2．…（5分）（Ⅱ）由f′（x）=0，得方程2x2-（a+2）x+a=0...
